Discussion
State whether the following is true or false.
Percentage excess is computed on the theoretical requirement, not on the amount actually supplied.
Answer: A
Correct answer: True
Percentage excess is \[ \frac{\text{supplied}-\text{theoretical}}{\text{theoretical}}\times100, \] so the theoretical requirement is the base. Using the supplied amount as the base gives a smaller figure and one that can never exceed 100 per cent, which is a quick way of spotting the error - 200 per cent excess air is entirely ordinary and impossible on the wrong base.
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